• Product Dimensions: 10 g
• Boxed-product Weight: 908 g
• Easy-to-install no calibration required
• High-sensitivity GPS receiver knows your position
• Customizable cycle computer
• Virtual Partner
• Courses lets you "race" against a recorded course to try to match

Training data: Speed, distance, cadence (305 only), heart rate (305 only), lap by position, elevation, average and max speed, calories burned, climb and descent
History: Automatically records up to 1000 laps. Download to your PC using included Training Centersoftware
AutoPause: Automatically pauses the training timer when you slow down below a specified speed. Timer resumes when you speed up again
AutoLap: Automatically triggers a lap every time you pass a specified location or travel a preset distance
Courses: Race against a recorded course and previous raced speeds at every point along the way. Combine Courses and Virtual Partner features and race an opponent that varies speed while climbing hills and navigating turns.
Virtual Partner: Race against a virtual competitor. Depicts a digital cyclist (desired speed) in relation to your real-time speed and shows how far ahead or behind you are.
Alerts: Speed, time, distance, heart rate (305 only), cadence (305 only)
Calories: Calculates calories burned based on user profile, performance data and altitude changes
Training Center: PC-based software (included) overlays ride data on a map and graphs speed, pace, heart rate, cadence and elevation. Create and schedule custom workouts or use workout templates and download to the Edge.

Navigation features

Receiver: SiRFStarIII high sensitivity receiver
Mark location: Mark and save up to 100 locations
Find location: Look up and navigate to stored locations
Back to start: Navigate back to starting location
Track log: 13,000 track points

Physical

Size: 1.75"W x 3.7"H x .9"D (44 x 94 x 23 mm)
Display: 1.17"W x 1.44"H (29.65 x 36.69 mm), 128 x 160 pixels, 4-level grayscale LCD with backlighting
Weight: 88 g
Waterproof: Waterproof to IEC 60529 IPX7 standards. All components are submersible in 1m of water for 30 minutes
Battery:800 mAh rechargeable lithium-ion battery 12 hours typical use
Antenna: Internal patch
Mount: 2-piece mount with zip ties mounts on stem or handlebars
PC Interface: USB

Sensors

Heart rate: Robust wireless transmission
sends heart rate data to Edge via chest strap
Speed/cadence: Self-calibrating wireless sensor mounts to bike's rear chain stay. Wheel magnet mounts to rear wheel for speed
cadence magnet attaches to crank arm.